Quote Originally Posted by photomc
Will approach the idea again later, and contact the manager of the PO to see if there should be any restrictions. In the meantime will continue to search for the facts, so that I can be better prepared the next time this happens.
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Check out some of these threads

http://www.photopermit.org/forum/viewforum.php?f=6

Most such limitations only apply to Defence Department locations or Atomic Energy Commission sites or such - very few "ordinary" Federal buildings are otherwise restricted.